librustc: Take in account mutability when casting array to raw ptr.

src/test/compile-fail/issue-14845.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+
+struct X {
+    a: [u8, ..1]
+}
+
+fn main() {
+    let x = X { a: [0] };
+    let _f = &x.a as *mut u8;
+    //~^ ERROR mismatched types: expected `*mut u8` but found `&[u8, .. 1]`
+    
+    let local = [0u8];
+    let _v = &local as *mut u8;
+    //~^ ERROR mismatched types: expected `*mut u8` but found `&[u8, .. 1]`
+}